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Computer Science > Distributed, Parallel, and Cluster Computing

arXiv:1101.0093 (cs)
[Submitted on 30 Dec 2010]

Title:Optimizing ccNUMA locality for task-parallel execution under OpenMP and TBB on multicore-based systems

Authors:Markus Wittmann, Georg Hager
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Abstract:Task parallelism as employed by the OpenMP task construct or some Intel Threading Building Blocks (TBB) components, although ideal for tackling irregular problems or typical producer/consumer schemes, bears some potential for performance bottlenecks if locality of data access is important, which is typically the case for memory-bound code on ccNUMA systems. We present a thin software layer ameliorates adverse effects of dynamic task distribution by sorting tasks into locality queues, each of which is preferably processed by threads that belong to the same locality domain. Dynamic scheduling is fully preserved inside each domain, and is preferred over possible load imbalance even if nonlocal access is required, making this strategy well-suited for typical multicore-mutisocket systems. The effectiveness of the approach is demonstrated by using a blocked six-point stencil solver as a toy model.
Comments: 9 pages, 4 figures
Subjects: Distributed, Parallel, and Cluster Computing (cs.DC)
Cite as: arXiv:1101.0093 [cs.DC]
  (or arXiv:1101.0093v1 [cs.DC] for this version)
  https://doi.org/10.48550/arXiv.1101.0093

Submission history

From: Georg Hager [view email]
[v1] Thu, 30 Dec 2010 14:55:02 UTC (120 KB)
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